shoe opinion please

Asking the husband is not much help so i turn to your honest opinion!
I bought these burberry wedges last year however i didnt know they would be too big--see the gap from the back of the shoe and my foot.
Now i really like them and still have not been able to find my size--> is there something i can use to make them fit better? (insoles dont work well because its a sandal) or should i give them up?

Sorry the pictures are not the best-my cat kept trying to attack the ties and i was trying to get a quick picture without her in it.
and in case you are wondering here is a pic of the little one right now looking innocent